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Effect of Vacuum Annealing on the Characteristics of Plasma Sprayed Al2O3-13wt.%TiO2 Coatings |
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| Authors: | Zhang Jingjing Wang Zehua Lin Pinghua Yuan Hongbin Zhou Zehua Jiang Shaoqun |
| Affiliation: | 1. College of Mechanics and Materials, Hohai University, Nanjing, 210098, People??s Republic of China 2. Huazhong University of Science and Technology, Wuhan, 430078, People??s Republic of China 3. Hangzhou Normal University Qianjiang College, Hangzhou, 310012, People??s Republic of China |
| Abstract: | Adhesion strength is one of the critical properties for plasma-sprayed coating. In this study, the plasma-sprayed Al2O3-13wt.%TiO2/NiCrAl coatings were annealed at 300-900?°C for 6?h in vacuum. The tensile bond strength and porosity of the coatings were investigated. The microstructure and the fracture were studied using optical microscopy, scanning electron spectroscopy, and x-ray diffraction. It was found that the tensile bond strength of coatings increased with the increase of annealing temperature until 500?°C, reaching the maximum value of 41.2?MPa, and then decreased as the annealing temperature continues to increase. All coatings presented a brittle fracture and the fracture occurred inside the ceramic coatings except for the coating annealed at 500?°C, which had a brittle-ductile mixed fracture and the fracture occurred at the interface of bond coating and the substrate. |
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